Composition for artificial stone.



UNITED STATES PATENT OFFICE.

HEINRICH MIELOK, OF NEJV YORK, N. Y., ASSIGNOR TO MIELOKS STONE ANDTERRA GOTTA COMPANY, A CORPORATION OF NEW YORK.

-COMPOSlTlON FOR ARTIFICIAL STONE.

QPECIFICATION forming part of Letters Patent No. 711,254, dated October14, 1902.

Application filed June 11,1901. Renewed May 26, 1902. Serial No.108,996. (N Sp imens-l T0 0% whom it may concern:

Be it known that I, HEINRICH MIELCK, a citizen of the United States ofBrazil, residing in New York, borough of Manhattan, in the State of NewYork, have invented certain new and useful Improvements in Compositionsfor Artificial Stone, of which the following is a specification.

This invention relates to an improved composition for artificial stone,in which besides sand, burnt magnesia, and chlorid of magnesium, kaolinor porcelain-clay is employed, so that artificial stone in the nature ofporcelainstones can be produced without burning the same in a kiln, asheretofore. Kaolin-stones were heretofore made by burning the same inspecially constructed kilns. The ,process, however, is notonly-expensive, but requires also a considerable length of time, usuallyfrom eight to fourteen days, before the bricks are thoroughly finishedand dried. These objections are all obviated by my improved composition,by which the artificial stone can be made at ordinary temperature withina period of from twelve to sixteen hours.

The invention consists of a composition for making artificial stoneconsisting of kaolin,

sand, burnt magnesia, and a concentrated solution of magnesium chlorid.These substances are mixed together according to the followingproportions: two parts, by weight, of kaolin, one part, by weight, offine white sand, one part, by weight, of burnt magnesia, and one part,by weight, of magnesium chlorid dissolved in water, so as to form aconcentrated solution. These substances are intimately mixed and theneither cast into forms, pressed, or tamped, according to the stone to beproduced. A greater or less quantity of water is used, according as themass is to be subjected to a casting, pressing, or tamping operation.

I have found by practical experience that natural magnesite, burned andsubjected to several grinding operations so as to produce it in a veryfine powder, is preferable for producing the proper qualityof stone. Thefiner the burnt magnesia used the better it is adapted for the bindingof the sand and kaolin. The

reaction in the mass takes about twelve hours,

the composition setting and hardening within this time. When a clearwhite color is desired, zinc oXid or any other white metallic oxid isused; but when any other color is desired a corresponding metallicpigment has to be added to the mass. For some purposesit is necessary toproduce a very light-weight kaolin-stone, and this may be obtained byadding to the mass a smaller or greater quantity of vegetable fibers.The proportions of the mass may be changed within certain limits,according to the special applications for which the artificial stone isto be used.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A composition for artificial stone, consisting ofkaolin, sand, burnt magnesia, and a solution of magnesiumchlorid,substantially as set forth.

2. A composition for artificial stone, consisting of two parts by Weightof kaolin, one part of sand, one part of burnt magnesia, and one part ofmagnesium chlorid dissolved in water, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

HEINRICH MIELCK.

Witnesses:

PAUL GOEPEL, JOSEPH I-I. NILES.

